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Molecular dynamics simulation study of the transport of pairwise coupled ions confined in C-S-H gel nanopores
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. School of Civil Engineering, Southeast University, 211189 Nanjing, PR China; National Engineering Research Center for Prestressing Technology, Southeast University, 211189 Nanjing, PR China.ORCID iD: 0000-0002-8372-1967
School of Civil Engineering, Southeast University, 211189 Nanjing, PR China.ORCID iD: 0000-0001-8942-0180
School of Civil Engineering, Southeast University, 211189 Nanjing, PR China.
School of Civil Engineering, Southeast University, 211189 Nanjing, PR China.
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2022 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 318, article id 126172Article in journal (Refereed) Published
Abstract [en]

Ions that penetrate concrete micropores have a significant influence on concrete’s properties. Studying the microscopic interaction mechanisms between ions and concrete materials allows the discovery of factors that significantly affect concrete properties from a new perspective. In this study, molecular dynamics techniques were used to simulate the transport processes of different ionic compounds (Na2SO4, NaCl and NaNO2) in C-S-H gel nanopores in a pairwise coupled way, so that a detailed investigation into how these ions interact with each other and how they affect C-S-H gel could be carried out. It was found that for anions entering the C-S-H gel nanopores, the order of transport rate is SO42->Cl->NO2. Furthermore, the SO4-Na ion pair greatly affects the transport rate of solution due to its strong binding stability. Additionally, this study found that the presence of sulfate ions changed the transport characteristics of nitrite ions, such that nitrite ions aggregated into clusters more easily, thereby disrupting the compatibility between nitrite ions and water molecules. As a result, the presence of sulfate ions reduced the rustproofing effect of nitrite ions.

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 318, article id 126172
Keywords [en]
Molecular dynamics, C-S-H gel, Coupled transport, Durability, Nitrite
National Category
Physical Chemistry
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-88612DOI: 10.1016/j.conbuildmat.2021.126172ISI: 000740103900002Scopus ID: 2-s2.0-85121963413OAI: oai:DiVA.org:ltu-88612DiVA, id: diva2:1623674
Note

Validerad;2022;Nivå 2;2022-01-01 (johcin)

Available from: 2021-12-30 Created: 2021-12-30 Last updated: 2023-02-08Bibliographically approved

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Tu, YongmingCao, JieDas, OisikFörsth, MichaelSas, GabrielElfgren, Lennart

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